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Summary

Leonard and Sheldon are brilliant physicists, the kind of "beautiful minds" that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door.

Sheldon, Leonard's roommate, is quite content spending his nights playing Klingon Boggle with their socially dysfunctional friends, fellow Caltech scientists Wolowitz, Koothrappali and Winkle. However, Leonard sees in Penny a whole new universe of possibilities... including love.

02 - The Codpiece Topology

Penny and Leonard compete to see who will be the first to move on after their breakup. When Leonard sees Penny with a handsome new guy (guest star TRAVIS SCHULDT - "Scrubs"), he enters into a rebound relationship with Sheldon's nemesis, Leslie Winkle (series regular SARA GILBERT).

03 - The Barbarian Sublimation

Sheldon creates a monster when he introduces Penny to the world of online gaming. Especially when her addiction wreaks havoc on his life.

04 - The Griffin Equivalency

Raj's ego puts all of his friendships in jeopardy when he gets an inflated sense of self. Newly famous because of an article in a magazine, Raj (series regular KUNAL NAYYAR) makes a disastrous play for Leonard's longtime crush, Penny.

05 - The Euclid Alternative

Leonard and his friends stage an intervention to make Sheldon confront his longstanding fear of driving.

06 - The Cooper-Nowitzki Theorem

A young grad student's attraction to Sheldon confuses everyone - including Sheldon himself.

07 - The Panty Piñata Polarization

Sheldon and Penny engage in a battle of wills as Penny vows to get revenge on Sheldon when he bans her from the apartment for a series of petty infractions.

09 - The White Asparagus Triangulation

10 - The Vartabedian Conundrum

Leonard just can't say no. When his relationship with new girlfriend, Stephanie, starts moving too fast, Leonard turns to Penny for advice.

11 - The Bath Item Gift Hypothesis

Christmas is a source of stress for Leonard - whose handsome colleague (MICHAEL TRUCCO) starts dating Penny - and his friends, who are being tormented by Sheldon's obsession with gift-giving etiquette.

12 - The Killer Robot Instability

When Penny's comment about Wolowitz's love life sends him into a depressed stupor, his friends lose their most important teammate in an upcoming fighting robot competition.

13 - The Friendship Algorithm

Socially awkward Sheldon develops a scientific procedure for making friends.

15 - The Maternal Capacitance

16 - The Cushion Saturation

A paintball game has surprising consequences for Leonard and his friends when it leads to a fight between Penny and Sheldon - and romance for Wolowitz and Leslie.

17 - The Terminator Decoupling

A train trip to San Francisco takes a major detour when Leonard, Sheldon, Wolowitz and Raj discover that beautiful sci-fi actress SUMMER GLAU ("Terminator: The Sarah Connor Chronicles") is onboard. Nobel Laureate for Physics and "Big Bang" theorist, Dr. George Smoot also makes a cameo.

18 - The Work Song Nanocluster

Penny's home hair products business becomes a complete nightmare when a caffeine-addled Sheldon takes over.

19 - The Dead Hooker Juxtaposition

There's a new queen bee in the building! Penny develops a rivalry with a sexy female neighbour moves in to the building and threatens to become the "new Penny."

20 - The Hofstadter Isotope

While Stuart (guest star KEVIN SUSSMAN), a fellow comic book-loving pal of the guys, romances Penny, Leonard and Wolowitz venture out into the world of "Ladies' Night" at a local bar.

21 - The Vegas Renormalization

Leonard and Koothrappali take a heartbroken Wolowitz to Las Vegas, leaving Sheldon locked out of his apartment and forced to bunk with Penny.

22 - The Classified Materials Turbulence

Things begin to look up for Leonard when Penny makes a surprising revelation on her second date with Stuart (guest star KEVIN SUSSMAN). Meanwhile, Wolowitz enlists his friends' help when he discovers a critical design flaw in his project for NASA.

23 - The Monopolar Expedition

On the second season finale, Leonard and Penny reconsider their feelings for one another. When Leonard and his friends decide to spend the summer working - at the North Pole - Penny is conflicted.

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